Vacuum and MSW interpretations of solar neutrino data with the LNW mass matrix

The Lehmann–Newton–Wu mass matrix, which was recently applied to neutrinos, is further investigated. The analytic results presented earlier are confirmed numerically for the solar density profile of the Standard Solar Model. The combined analysis of atmospheric and solar neutrino data favors the MSW solution over the vacuum-oscillation solution. The total rates from the solar neutrino detectors favor two regions in the (m1,m2,m3) mass space, with the heaviest one, m3∼0.05 eV. The spectrum distortion reported by the Super-Kamiokande collaboration favors one of these two regions, which has two light (m1,m2≲0.003 eV) neutrinos.